XCTestExpectation Gotchas

Jeremy W. Sherman:

XCTestExpectation simplifies testing callback-style code, but some of its design choices make tests using it fragile unless they’re mitigated:

• It explodes if everything works right but later than you expected.
• It explodes if everything works right more than once.

This article presents two concrete mitigations:

• Use weak references to ensure the expectation dies before it can cause you trouble.
• Use a different promise API to do your waiting.

iOS Mac Programming Swift Programming Language Testing Xcode

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